The influence of Fe, Cu, SiO2, TiO2, and Al2O3 nanoparticles in aqueous solution on proton relaxation times

Measurements of proton nuclear spin-spin and spin-lattice relaxation times are applied for determining the concentration of solid-phase nanoparticles in nanofluids. This approach is tested for metal oxides SiO 2 , TiO 2 , Al 2 O 3 and metal-carbon nanoparticles of 3d-metals Fe and Cu. It is shown th...

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Bibliographic Details
Published in:Journal of engineering thermophysics 2011-03, Vol.20 (1), p.55-63
Main Authors: Bagryanskaya, E. G., Krumkacheva, O. A., Belikov, A. E., Mal’tsev, V. A., Novopashin, S. A.
Format: Article
Language:English
Subjects:
Fluid- and Aerodynamics
Physics
Physics and Astronomy
Thermodynamics
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Summary:Measurements of proton nuclear spin-spin and spin-lattice relaxation times are applied for determining the concentration of solid-phase nanoparticles in nanofluids. This approach is tested for metal oxides SiO 2 , TiO 2 , Al 2 O 3 and metal-carbon nanoparticles of 3d-metals Fe and Cu. It is shown that the sensitivity of the method for determining concentrations of 3d-metals is much higher than for oxides (by 2–4 orders of magnitude). It is revealed that measurement of the proton spin-spin relaxation time allows one to determine the concentration of Cu nanoparticles to 0.0001 mg/ml and that of Fe nanoparticles to 0.00001 mg/ml.
ISSN:1810-2328
1990-5432
DOI:10.1134/S181023281101005X